The police chief at California State University, Sacramento, said one "device" was found Wednesday, but confirmed it is one of many already found on campus that are made up of trash, rocks, batteries and other harmless items.

Last week, 15 similar devices were found on campus, but did not pose any threats.

Sacramento State police chief Mark Iwasa said officers are trying to guard against complacency and urge people at the university to remain alert and report any suspicious activity or packages.